Cousteau, Jacques-Yves (1910–1997), a French oceanographer, inventor, and explorer. In 1943 he and mile Gagnan invented the Aqua-Lung, a portable breathing apparatus for diving. Cousteau pioneered modern skin-diving techniques and underwater color photography and the underwater use of television cameras. His Diving, Saucer, built in 1959, was the first research minisub. Cousteau's many award-winning films, books, and television documentaries brought popular attention to undersea exploration and marine life. In 1975 he led and filmed an undersea archeological expedition off the coast of Greece.

Cousteau began diving in 1936 while a gunnery officer in the French Navy. During World War II, he served in the French resistance movement. In 1957 he left the navy to work full-time on underwater research.

His books include: The Silent World (1953); The Living Sea (1963); World Without Sun (1965); The Shark: Splendid Savage of the Sea (1971); The Ocean World of Jacques Cousteau (1973), a 20-volume encyclopedia; Jacques Cousteau's Amazon Journey (1984).